While the mapmodel registry works fully automatically for all auto-
downloaded models, it does not check for manual changes to the filesystem.
To clear models from the list that have been deleted from the profile
directory and to add models that have been downloaded outside the game,
this new menu entry can be used.
mapmodelregistryclear deletes all loaded mapmodel attributes
loadallmapmodels checks the filesystem for mapmodels and loads them
(all trees below packages/models/mapmodels, in home, zips, mods, install)
Both together rebuild the whole mapmodel database.
DOCREF mapmodelregistryclear